Source Code Cross Referenced for PropertySetProxy.java in  » Library » Apache-beehive-1.0.2-src » org » apache » beehive » controls » api » properties » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Apache beehive 1.0.2 src » org.apache.beehive.controls.api.properties 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         * 
009:         *     http://www.apache.org/licenses/LICENSE-2.0
010:         * 
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         *
017:         * $Header:$
018:         */
019:        package org.apache.beehive.controls.api.properties;
020:
021:        import java.lang.annotation.Annotation;
022:        import java.lang.reflect.InvocationHandler;
023:        import java.lang.reflect.Method;
024:        import java.lang.reflect.Proxy;
025:
026:        /**
027:         * The PropertySetProxy class is a dynamic proxy {@link InvocationHandler} class that exposes the
028:         * values held within a PropertyMap as an Object implementing an annotation type interface.
029:         * <p>
030:         * This enables properties resolved using the {@link PropertyMap}'s hiearchical resolution mechanism to
031:         * be exposed to the client of the proxy in the same way that Java 5 annotations are 
032:         * exposed using raw Java reflection APIs.   A proxy of this type should behave identically
033:         * to the one returned from a call to <code>AnnotatedElement.getAnnotation()</code>, but backed
034:         * by a richer, more dynamic resolution mechanism.
035:         *
036:         * @see java.lang.reflect.Proxy
037:         * @see java.lang.reflect.InvocationHandler
038:         * @see java.lang.reflect.AnnotatedElement#getAnnotation
039:         * @see org.apache.beehive.controls.api.properties.PropertySet
040:         * @see org.apache.beehive.controls.api.properties.PropertyMap
041:         */
042:        public class PropertySetProxy<T extends Annotation> implements 
043:                InvocationHandler {
044:            /**
045:             * Creates a new proxy instance implementing the PropertySet interface and backed
046:             * by the data from the property map.
047:             *
048:             * @param propertySet an annotation type that has the PropertySet meta-annotation
049:             * @param propertyMap the PropertyMap containing property values backing the proxy
050:             * @return proxy that implements the PropertySet interface
051:             */
052:            public static <T extends Annotation> T getProxy(
053:                    Class<T> propertySet, PropertyMap propertyMap) {
054:                assert propertySet != null && propertyMap != null;
055:
056:                if (!propertySet.isAnnotation())
057:                    throw new IllegalArgumentException(propertySet
058:                            + " is not an annotation type");
059:
060:                return (T) Proxy.newProxyInstance(propertySet.getClassLoader(),
061:                        new Class[] { propertySet }, new PropertySetProxy(
062:                                propertySet, propertyMap));
063:            }
064:
065:            /**
066:             * Private constructor, called only from the getProxy factory method
067:             */
068:            private PropertySetProxy(Class<T> propertySet,
069:                    PropertyMap propertyMap) {
070:                _propertySet = propertySet;
071:                _propertyMap = propertyMap;
072:            }
073:
074:            //
075:            // InvocationHandler.invoke
076:            //
077:            public Object invoke(Object proxy, Method method, Object[] args)
078:                    throws Throwable {
079:                // Handle cases where Object/Annotation methods are called on this
080:                // proxy. We were getting null back from Annotation.annotationType.
081:                Object value = null;
082:                if (method.getDeclaringClass() == Object.class) {
083:                    try {
084:                        if (method.getName().equals("getClass")) {
085:                            value = _propertySet;
086:                        } else {
087:                            value = method.invoke(_propertyMap, args);
088:                        }
089:                    } catch (Exception e) {
090:                        e.printStackTrace();
091:                    }
092:                } else if (method.getDeclaringClass() == Annotation.class
093:                        && method.getName().equals("annotationType")) {
094:                    value = _propertySet;
095:                } else {
096:
097:                    // Query the nested value in the property map
098:                    PropertyKey key = new PropertyKey(_propertySet, method
099:                            .getName());
100:                    value = _propertyMap.getProperty(key);
101:
102:                    // If the returned value is itself a PropertyMap (i.e. a nested annotation type),
103:                    // then wrap it in a PropertySetProxy instance before returning.
104:                    if (value instanceof  PropertyMap) {
105:                        PropertyMap propertyMap = (PropertyMap) value;
106:                        value = getProxy(propertyMap.getMapClass(), propertyMap);
107:                    }
108:                }
109:
110:                return value;
111:            }
112:
113:            /**
114:             * Returns the PropertySet annotation type associated with the proxy
115:             */
116:            public Class<T> getPropertySet() {
117:                return _propertySet;
118:            }
119:
120:            /**
121:             * Returns the underlying PropertyMap containing the property values exposed by the
122:             * proxy.
123:             */
124:            public PropertyMap getPropertyMap() {
125:                return _propertyMap;
126:            }
127:
128:            private Class<T> _propertySet;
129:            private PropertyMap _propertyMap;
130:        }
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